Question

the pitcher plant and venus flytrap are green plants that can photosynthesize.why do they need to feed on insects

Answer 1

the pitcher plant and Venus fly trap are green plants and can perform the process of photosynthesis but they need to feed on insects for completing their nitrogen requirement and some other nutrients which they cannot get from soil so they feed on insects also
hope this helps

Answer 2

the Pitcher plant and Venus flytrap are green plants that can photosynthesize but they need to feed on insects because to complete their nitrogen requirement, these plants grow in soil that is not so rich in nutrients and the dependent insects for their food
hope it will help you